Application: gvSIG desktop

    public Geometry offset(int joinStyle, double distance) throws GeometryOperationNotSupportedException, GeometryOperationException {

        MultiLine2D result = new MultiLine2D();

        for (Iterator<Primitive> iterator = primitives.iterator(); iterator.hasNext();) {

            Primitive primitive = (Primitive) iterator.next();

            Geometry offset = primitive.offset(joinStyle, distance);

            if(offset instanceof MultiLine){

                MultiLine multiOffset = (MultiLine)offset;

                for(int i=0; i<multiOffset.getPrimitivesNumber(); i++){

                    result.addPrimitive(multiOffset.getPrimitiveAt(i));

                }

            } else {

                result.addPrimitive((Primitive)primitive.offset(joinStyle, distance));

            }

        }

        return result;

    }